Approximate Hybrid Model Questions and Answers

This set of Electronic Devices and Circuits Multiple Choice Questions & Answers (MCQs) focuses on “Approximate Hybrid Model and its use in CE, CB, CC”.

1. What is the approximate hybrid parameter current gain of a CE amplifier?
a) -h_fe
b) h_fe
c) -h_fc
d) h_fc
View Answer

Answer: a
Explanation: The current gain of a common emitter (CE) amplifier can be expressed in terms of approximate hybrid parameters. The current gain h_fe is the forward transfer characteristics and is used to calculate the current gain in common emitter amplifiers.

2. What is the approximate hybrid parameter input resistance of a CE amplifier?
a) h_oe
b) h_ib
c) h_ic
d) h_ie
View Answer

Answer: d
Explanation: The input resistance of a common emitter (CE) amplifier can be expressed in terms of approximate hybrid parameters. The input resistance is universally expressed as h_ie. This is also the same for approximate as well as exact hybrid models.

3. What is the approximate hybrid parameter voltage gain of a CE amplifier?
a) h_fe × R_L / h_ie
b) -h_fe × R_L / h_ie
c) h_fe × R_L / h_oe
d) -h_fe × R_L / h_oe
View Answer

Answer: b
Explanation: The voltage gain of a common emitter (CE) amplifier can be expressed in terms of approximate hybrid parameters. The voltage gain is equal to -h_fe × R_L / h_ie where, R_L is load resistance, h_ie is input resistance and -h_fe is the current gain.

4. What is the approximate hybrid parameter current gain of a CB amplifier?
a) -h_fe / 1 + h_fe
b) -h_fe / 1 – h_fe
c) h_fe / 1 + h_fe
d) h_fe / 1 – h_fe
View Answer

Answer: c
Explanation: The current gain of a common base (CB) amplifier can be expressed in terms of approximate hybrid parameters. The current gain h_fe is the forward transfer characteristics. The current gain of a common base amplifier is expressed as h_fe / 1 + h_fe.

5. What is the approximate hybrid parameter input resistance of a CB amplifier?
a) h_fe / 1 – h_fe
b) h_fe / 1 + h_fe
c) h_ie / 1 – h_fe
d) h_ie / 1 + h_fe
View Answer

Answer: d
Explanation: The input resistance of a common base (CB) amplifier can be expressed in terms of approximate hybrid parameters. The input resistance is h_ie / 1 + h_fe where, h_ie and h_fe are the input resistance and current gain of CE amplifier respectively.

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6. What is the approximate hybrid parameter voltage gain of a CB amplifier?
a) h_fe × R_L / h_ie
b) -h_fe × R_L / h_ie
c) h_fe × R_L / h_oe
d) -h_fe × R_L / h_oe
View Answer

Answer: a
Explanation: The voltage gain of a common base (CB) amplifier can be expressed in terms of approximate hybrid parameters. The voltage gain is equal to h_fe × R_L / h_ie where, R_L is load resistance, h_ie is input resistance of CE amplifier and -h_fe is the current gain of CE amplifier.

7. What is the approximate hybrid parameter current gain of a CC amplifier?
a) 1 + h_oe
b) 1 – h_oe
c) 1 + h_fe
d) 1 – h_fe
View Answer

Answer: c
Explanation: The current gain of a common collector (CC) amplifier can be expressed in terms of approximate hybrid parameters. The current gain h_fe is the forward transfer characteristics. The current gain of a common collector amplifier is expressed as 1 + h_fe.

8. What is the approximate hybrid parameter input resistance of a CC amplifier?
a) h_ie – (1 + h_fe) × R_L
b) h_ie + (1 + h_fe) × R_L
c) h_ie – (1 + h_fe) / R_L
d) h_ie + (1 + h_fe) / R_L
View Answer

Answer: b
Explanation: The input resistance of a common collector (CC) amplifier can be expressed in terms of approximate hybrid parameters. The input resistance is h_ie + (1 + h_fe) × R_Lwhere, h_ie and h_fe are the input resistance and current gain of CE amplifier respectively and R_L is the load resistance.

9. What is the approximate hybrid parameter voltage gain of a CC amplifier?
a) 1 + h_ie × R_i
b) 1 – h_ie × R_i
c) 1 + h_ie / R_i
d) 1 – h_ie / R_i
View Answer

Answer: d
Explanation: The voltage gain of a common collector (CC) amplifier can be expressed in terms of approximate hybrid parameters. The voltage gain is equal to 1 – h_ie / R_i where, R_i is equal to h_ie + (1 + h_fe) × R_L.

10. We use approximate hybrid models for transistors because they introduce less than 10% error.
a) True
b) False
View Answer

Answer: a
Explanation: For the analysis of transistor amplifiers we use approximate hybrid models instead of exact hybrid models. They introduce less than 10% error which can be ignored since hybrid parameters themselves are not steady but vary considerably for the same type of transistor.

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